Britney Spears and Paris Hilton have become the best of friends since the pop superstar filed for divorce from Kevin Federline, the two are now like sisters, according to Hilton’s representative. The phantastic party pals  have frequently been spotted out on the town over the past several weeks, and according to Hilton’s spokesman Elliott Mintz it’s more than just a passing fancy.

He tells entertainment Web site TMZ.com the two are “really forming a bond” and that they’re “becoming like sisters.”

Mintz claims 24-year-old Spears “looks up” to 25-year-old Hilton and that she’s “extremely grateful” the socialite has taken her under her wing.  Mintz says Spears’ sexy new style, which consists of wearing barely there skirts and cleavage-baring tops, has been “inspired” by Hilton.

The duo partied together at Los Angeles club Hyde on Saturday night wearing matching fishnet stockings on only their right legs. They were also synchronized when they hit the town again on Sunday night, when they both wore black t-shirts emblazoned with the words “I’m Paris Hilton I can do whatever I want …”

Downplaying recent reports of a fight between Hilton and Lindsay Lohan over the weekend, Mintz claims the three women have, in fact, created an alliance.  He adds, “What I’ve observed is that we have three extraordinarily powerful women who generate a tremendous amount of attention, money and adulation and they’re tired of other people trying to ride on their coattails and creating false drama.”

In related news, Britney Spears is taking steps to cover up after her underwear-free partying landed her in publications around the world flashing her privates.  The pop superstar has twice been caught without panties in the past week, while partying with new pals Paris Hilton and Lindsay Lohan, among others.  But now, in an effort to keep her privates private, Spears has spent a whopping $3,800 on underwear.

The singer was spotted buying thongs and bras from trendy Hollywood boutique Le Bra Lingerie, where Katie Holmes went shopping for sexy lingerie before her recent Italian wedding.

A source says, “Britney came in with a female friend. She tried on everything she bought. She’s a 36C. She said to her friend, ‘I could live here.’”  Among the single mother-of-two’s reported purchases were a camisole and thong set for $1,666 and a sexy black corset and matching red thong for $380.